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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ee667fcf9a7e2528738f093d9800848f201ee0878191a9be77a3da0e0780e1' 
  AND token = 'TqwKViicdqs354qinqhCxPSua8mszb6kCx5x1v4Mpts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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