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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b14e4863d21b6db174a6be26b0969428ca7248ba4f7c707a4800aae1ad612bc' 
  AND token = 'Y4Da620awKDBKI96Eu9w89t9EdRX4IlHgTIRmkZfypU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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