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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3aa5f80690e71051320fd230e00e0ca335893e599555b3661e40a90ef8bdcc' 
  AND token = 'Ok/OMp4cGFFqFWLkGJ6XpYIz59pw8EBvM0cPxw0OCiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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