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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3aed452ec4670651df00a3e86aa0035f47ff4c9573e7b8446f44b687208e7c0' 
  AND token = 'GwXWaGL8Pl5VvdfPo8fO1VmAbC7pHqJn3xnS7fbyeMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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