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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f31dfc5f5e4fc4b5e0ab011aaa948cf80db18e9050d769b172a09dcc4e91dc' 
  AND token = 'uoeNiXTGTxNbcC/n9iAqZNdrBT0U4GvOrTixPQ/34hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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