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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafdc9a19c3912d3c1e94d3fa0822105ec3c9fac2f5a9c44ee7ebbb99116e0cc' 
  AND token = 'wHwH06O8l9eKNpQXrhwKurPx+OpdkbfiD/zD2CpFsa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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