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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fcf1ebf42e41a6306c6f95ed4b79d963b680594cf845189160b55e87d91940' 
  AND token = 'Z9aD1Q/355+ezPZx6a9ilqDbGIbydb0Dv3jLJYHCZgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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