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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a653db1a410d31c2592de7e426c8678f689d100f9c01cb88cd165b8c52497980' 
  AND token = 'YaLGKuz4NceafMfbhLETBcQUTIXU89Y8I6E48keHZP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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