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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e4e48f7dd19736c1a7ea34ec9eaa51cb66be6a643735bfcca8517e2c9d4d19' 
  AND token = 'blVQcU1UwowRbnFCeLwq46lNwbYKVtjZcXBs3AESXJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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