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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a42f4daafb4850bb8bd132449e4ca8e61e0c20f59d172761f1ef690180cffa' 
  AND token = 'Y8XYCyMijpKcVRH4JsdA/DK/RliWK27IbUhWPvs6lcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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