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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c97e2d71c51c5bfcbe6ff64aa5bd12c0bf04cd03fe14040e1041f78635cbdd' 
  AND token = 'GUnwbhhCWqxUwMP9A8UpNAkG/zbD9WFLvD6LfCUlotM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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