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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a75ecfa9a1524aaf2084c9a1ae7d4eaa8cc09e2b4b3682f7b8a148f7a2cc064' 
  AND token = 'ZZGevWCu99zvp1iW0w2RZ/MQaTPuIEBuNYVx/4wtl9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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