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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b96f8704efb8da263648f86dd9997878f039cbc7badccf5b16c5a5d3924bfd9' 
  AND token = 'D9lZdZz4Q61+lUD6SxL24MxT//rYRn9INHDkSxeezlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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