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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa50a32a55b0fd19752769e6fd1469c64bd2e74229cf0a1b1e4292653ce5f9dd' 
  AND token = '2chELDhNrURqirxZ9kEILiWiiElBkLP1NGbebSztTlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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