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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85563435f482905ebc00e7c8b9c0ae65128a6873ce2405c9230b067bdca038c' 
  AND token = 'NjUGbOCCE7CaNlDMw4C8ukGJCKjKCMvFV7JYorltVPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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