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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65e7ec67923b3565352da6f34dd4e9c40482379f35493e9f506c2f861f120e1' 
  AND token = 'aN7VvFSFMvdkjbIXochCN8Tr4MhkHe2wViZAA3xARWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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