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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1bd3a4562ef0986f5c5990d394a6523fbdc2136b984ed002a3ac9413d76e4d' 
  AND token = '9WMrV/LJXAGIzhX0GbhDu40JNv5y0ee9v6LDbi8vvok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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