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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e739fe9f99581d69d637ea2c306dbcf6de587805f5e28e5c9494473d318047b8' 
  AND token = 'gFYc8+KZ5k6MZhdywJU4I69QdD76NjD95hG5kwZ5MzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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