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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d25b18abd9e878ca24d8066badfc7887a3d59618446ea6f212d9616cf7252c' 
  AND token = 'cNp0Yy0ssrUA1ka4kdLzBCB0MNNWvEpL6/l2+wzueA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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