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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad42a94989c5bf83fa7bc7cf5d0dffa00c1a9a8c5b3c9519fe720c0772a161b' 
  AND token = 'SicQ3fBSupTT+hZjItqRQIl3MQCtT38bcURFuqJeZtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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