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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d764ad8e06682e9c3a232197edd43a8e2ff5b9966e117209f367b1e78d9270a' 
  AND token = 'NslEe9bhCwp0L6ibFDJ8tSZQ9JnHXhO0+/HNzMlb2Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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