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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a19256c0ba58a8147a74c916938f0e0cce642db64257a1704d2b1c08a46666' 
  AND token = 'AoaWyx1N8RVfxIUoyn3PH6YXKYV/7jRDHK3xrLzPDeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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