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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab220f18a19a4a32472be7c0dc67aa97619cf54ee907d6a57db1cefadab01647' 
  AND token = 'L8ks3f/3jeqb8AL3A0JhpvtbKGPw/80x4v2+aj2q1FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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