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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aad98c393d6192d62a4f811cc887ff1029e6264aff5ab1b06356bd8dc2e061e' 
  AND token = 'XZUzCzZnD72RxcKtWR43TQC3RDqyibUX/u+jPHp97ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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