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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13396e99f1dc17ac6a233f7be7519e20e5f3dd14abf2d97a8683259cb9a8ddc' 
  AND token = 'gj9U4yQCe+WKKmJvECAqvJzCIvmHiz0zpipc1KGipp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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