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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdfb88a21cbca88350a9c6426a343c2e163b689e6be9b8052283836ae25b901' 
  AND token = 'c5EtFOQcO9ucJRpphYLo9dep7QZVeKkVV8hDXW3YCT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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