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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482c0aca0d3556573a42f15a513247b8244fc899eb7b9eb87fa8f28c026ff1b7' 
  AND token = '0n2lvmWB25u1yCmBA5CmXTj9YgOC5fdYomL01PShfds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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