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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083548cb58e745ec24cb1c097fa665101580914043fbeee4f4c5119138b8eb41' 
  AND token = 'qXiMQK6gTOk58dPj53OtElooANi48OIxXAl5E1ojY/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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