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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354c3bed1f5d51b5f03d849d445e05eb4225a79ab72fc357fe3c221b5b2c9ea4' 
  AND token = 'PUKVbF5vUbG13vStUxJs/Sg90MlDrvff9d84nuCbY7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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