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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c40fc76b2d6214943e35d276b133f377b81cdcfccceb22f06e990917bff296' 
  AND token = '3lNCyniVdHTMr6yFazc8yl2V9DhhlKQ8mQJmKBkt+es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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