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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136c7817bbd82f856fc482b9dda0009d9bc5f66954fd1d9f50c5810dd46b9cf5' 
  AND token = 'Q0AHt9esiMT2gbU+/yK9If0XGn1Z1dVddZTP8ad++VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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