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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54993531429733f54523e0c1ee944210f3de11ea5f766af0b40bea7ffeeddb7' 
  AND token = 'TnNo9hjrA0rsXqQ5ZTmzmjF4aRiEYJg7yo9Xf9h8pjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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