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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95be31f13d854a6626d8bf031d3c2d64214018f2f3849a8ef1cd3d6a535b7b29' 
  AND token = 'lQdRIuYyju1px1WKV3l5FjFvNFpvx9jLovVvOnESrGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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