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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb481e2a02aa05f7d5f6169e7fae9a926a4e459c240c27928554e962e20cb00' 
  AND token = 'mdtJttSaoFwIhhlP0NwD58GU77VOr6E7JUIq++GaUi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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