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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406b8d58ab37bf5d74a67291bbf8d0cfd94b0016a1f3c4530d76f372428d61bd' 
  AND token = '8zie++X2bz5OlWh5Ce+o1iYMFJU0ZEdq2u5eZNH8CFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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