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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38de300f1c80eacb18b0786e196cc759eb69df616e2ee156f893efafde3f7eb4' 
  AND token = 'uN79yNOzXSeO9WzK750C3sIMBA3tjH0rP8NJXaC9+Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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