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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df02280417d104973ec8332e90e33ff17824ebfd2e77183ded311479eeb42c41' 
  AND token = 'eHcdW6jRcL2pjuu3cWlVDXFvotu3nGqX6K5Zx9dn8m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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