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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c674ebe5bd9d756cba7abdbfe17d1c03bedbb70047df2e69acebcf8dbcab752' 
  AND token = '8twfGNexIJF7eXAj4McEuW5WH1abk7sBDPH/+nLNG6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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