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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350d910315ff70e7d7b126d443fda60d6125402595c79ce1b64b61a2f34a857f' 
  AND token = '0dvpETHXlYNEJBW+jck1r0jb2bRrwKKoO3ZtLDcbYcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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