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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0980d2cc49ef58eb739adf613576c6276889b10f7d56f85ec365760a367ff09' 
  AND token = 'oZY4UUAQ52Ao94LQZUOpywgCd9lBmJyCa+6eOJfodFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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