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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34d05557eb931731e54766d68b2f3ec5efd5b89ee06c1cf3fa46a8ea79eb2ed' 
  AND token = '5YBLnTU+W6xbZl188ckdqFAyl2no8Kb9RFK38G+jHcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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