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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6710473c60654257cb03896e4a43b556255f5de029b4e9c293d03e8604b335e' 
  AND token = 'Fv0NSzSSqUZTTbUG5umpkqw5AQWrJrCvENQPJzVc6E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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