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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d3f325cb1fc9b4a3d50303b2c97164aa9333ca94e4d6ec6ac63025359f873e' 
  AND token = 'oQ09hXOwIQ3vCqvlm81d8yUBZ0aZKCPh6XqD5EqA/Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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