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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678359c7d14f9cf9bac1104a1c5acda58e41578bb356e7ff3b08225217bacdcc' 
  AND token = 'w+L6vny7R7cinV/5zH+bUNhw8YF1Pyjl0QAT6ESNw/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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