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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17eec8a437f8d953b4f355ad1e8ba3fdc1f188e38f21832bca7dc4867ddc8df7' 
  AND token = '4ZEcGZV4ao9lHW+zv7W5YU8h700niy+w9yKwqpUI8tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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