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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45aa6bd0258c15093db988b6651b604674242c8c50bbd2840c8eb259973592a0' 
  AND token = 'UnKgIDAXB9YN+BM/GCUinXlFkTN9Ze6HOwQdzlpHUEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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