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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62d755311d38e16b515518b9299f7e65b3f56e8300a13b18cdf94d80f1361b4' 
  AND token = '+2Bla+JYHybi4zOOiBWBuGJF6W1hwdBhM4CGJe29x0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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