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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89f8a9729ab025ea744f5e918f7d5a7cf56972f859782aaaa83061537651cba' 
  AND token = 'LbILNtkgHmQWgGa4IKOy7D1kbVHz3EJGngN+DWiiXiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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