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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936e61bd070e5436dd9edc469a93dd492757b945667105ee03f4fed04f247d77' 
  AND token = 'XOTt1qwNw95AC6toSCzvlUUi8T1E8aDLi1WOUMXJiMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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