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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c2d2f3234aaab5b0510b7b5573a43c4eaeda9dd50937f7710e46e70449379b' 
  AND token = 'UXDPnr0BbS4/8+Ch9XUkbS8zF9ybx+KJk+Ga6axDEG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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