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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835b71d1c32a0dec47b099a1b9f4da218f996fa6698242a88ab1b164ac31990c' 
  AND token = '+2WcABg9Z4heensVektoMEZd3jo1a7ww1s1hMkCBjiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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