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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fe5e85ba7dd1055a78a402c749d369a3d62f9179378d2cecb797893f67200a' 
  AND token = 'ydk0gI7xVjfdIJqOO1jjELn9b0nEHVK8WWrhC/wwsos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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