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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218b17e4e3be9a8a2c30d18e0cf67922531bfd76a360238a63d4a77ae0cf50fa' 
  AND token = 'vn6vO463cAw6uGzg/TFKzf5ZyFiRjxdoNGRJ2KOdDiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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