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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3740ff66f4d47c4086eb20d53368a35b667dc98940ce022ef12f3bafe5390fb4' 
  AND token = 'mGdTFglaKfP8jpE7K0xMoZBbizy6t9DezbSK+D9/ctA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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