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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7632d9b4e70cfc51d6db299faaf365e68f3b098b3ced0cdaaf43408654f42e22' 
  AND token = 'XMAQ68ELyeCuH2qSd4A3KvP7nkE7lAF6mIcogz+DdgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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