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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35abfac96fcee2228dd5ac008ec8aa878411a4f80db156ec3acc4adfc26eb6a' 
  AND token = 'S8OsTJ35zP5Xk9mQ/kKhGtFQ5mP7M+Z2xMXqqKl96Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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