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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc4185eab8d817080d9b56587bb02a910c8905a3e398419013688b980e0f1f8' 
  AND token = '/RJVkDfnctTqbKrKSCI6GgHrLwn5RP0bBIAMcyf+tNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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