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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ebf7d216bbb418b7e8ca444efbff2014ab50e72417be6293dc4d066092e4ff' 
  AND token = 'nopmawEU9KDuywAu1k6qFbpGukVKMctSudrtVF49pNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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