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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c72e9f80cec6d4a1c3bb1e72c7e3de21117aaf68d2583b3086797808c0bf09f' 
  AND token = '5Q+hUQlTW+eYCqo0LN4nm9JQkMNtZ3ZYQFJgNi+OkfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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