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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf6eab2b4b1618a68bc03d5ec772c1fbbdb3f250f72cdc82cbf6086b10fe63d' 
  AND token = 'CVbckVoD2Jui5M6yHsDVO9pCRhIIgI6mNaW4OmqOjSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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