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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd599349b091fa08976589c58dba620860d32768a14924b9f7396066508ac850a' 
  AND token = '4lI+UA/K6jGz1QtC9nwpOwVfEFDbeUtJAQ0dkp2h4I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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