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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e00ae3592b63cf01d28ed49fce3bfd4b6eb5d67b79653a9ac24408f40fe916' 
  AND token = 'tHH2lLlZu4BUR1QUayh8juP+QUPEIr7KIfjec01HGto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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