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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94a4675499ae7f9a7d4086b438c7c427b4cc70f7eb0c8ac3c90765549916bf8' 
  AND token = 'fbFxY8qIpPIQGOfgWtNXGUMEMlTLnk9Y77fQzjw/WlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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