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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0990474f1cea5987cf5499bc2ae4a095a11d4c39c00a2c2d04e4d59c8f334c9e' 
  AND token = 'eEKo7oQTETLHKH0YlBL0s91M+0ioYWT90unR2MCEguQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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