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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f324301b1f0f6ac5e4af2d668a52bf3581e9ffc656019fcd32f8403099aa8362' 
  AND token = 'V0FKYnsd77sgo8ETCGfHaQT69G/NKhwFWqYwPYnFUSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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