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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61104be88757be089c5d314d63b1041f5288a5f6b45409a8a0703facc47bff91' 
  AND token = '0jccGVKfXwdIJSiDXRv95dU9PHHIqmQotqtdBE9rovY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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