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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3097c4d498142c1edc73de9305463f55cd8b185be491b5fc47953269bcc1d4' 
  AND token = '9BWWx7MBpjTX+FPedBz7ipFGg4PfQC25hQEftWwDaNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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