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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476f7269bfc3c540da708478d7cff39e95b51e69ee44881af584c57a1eba45b9' 
  AND token = '1XYd0/LeuJ75VBD42CieW55bFacWklnKx6EX5zbQLHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}